bobbins



L. s. ROBBINS.

STONB'POLISHEE- Patent' ed Apr. 24, 1855.

I 'UNITEZSTATES LOUIS s.RoBB1Ns, or NEWYOBK, N. Y;

PATENT OFFICE.

Specification of Letters Patent No. 12,766, dated April 24, 1855.

' 1 To all whom, it may concern: a l

Be it known that I, LOUIS S. ROBBINS, of a j the city, county, and Stateof New York, have invented certainnew and useful Im- 5 ,provements inMachines for Smoothing or Polishing Stone or other Substances; and Ihereby declare that-the following is a full, clear, and exactdescription ofjthe same, reference being had to the accompanyingdrawtary motion from the power; employed, by means of the band a,andjfixed pulley 6; this shaft also forms the axis of a crane or derrick(C) which moves freely thereon, and is constructed in any suitablemanner with a jib or lateral projection c properly braced, andstayed. II I I A vertical shaft (D) has its bearings in a the jib a, and in abentarm E proceeding from and securely attached to the upper side of thejib; it derives a rotary motion from the shaft A, by means of the largefixed pulley d, the band 6, and small fixed pulley f.

axis theshaft D, upon which it moves freely. Upon its periphery it hasprojecting handles (g) by which itis moved with facility by anattendant.

"A radial arm (Gr)- has also for its axis the shaft D, and traversesfreely thereon; I it extends to the periphery of the wheelF, and affordsnear its outer extremity a beara bearing in the wheel responding with afeather upon the inside of the sleeve, to its lower end a chuck orsuitable for a rubber or polisher is fixed ing, making part of thisspecification and,

step in the bed piece Brand derives a rosocket or step near the outerextremity of A large horizontal wheel (F) has for its ingfor thevertical sleeve H,which has also sleeve H, having a longitudinalgroovecorholder (L) isfattached, by an, universal. joint; apiece of stonejorother material,

to the under side of the holder L by any convenient means; it derives arotary motion from the shaft D by means of the fixed pulley h, band i,and fixed pulley is, upon the sleeve H.

Any required number of revolving rubbers can be used upon theperipheryof the wheel F by increasing the number of radial arms, andgiving motion to them by means of bands, and pulleys either direct fromthe shaft D or from one to the other. The rubber L is self-adjusting'tothe surface to be acted on, by means of the universal joint by which itis attached to the spindle I, and the vertical play of the said spindlein the sleeve H.

The wheel F answers a two fold purpose. It afiords a ready andconvenient means in connection with the crane G of moving the revolvingrubber to any part of the surface where it may be required to act,andgives a second bearing to the revolving sleeve H by which much strain isavoided.

Having thus described the construction and arrangement of the variousportions of the machine that I find to be most convenient in practice Iproceed to explain its operation upon a block of stone (M) previouslydressed, and placed upon a suitable platform or bed.

Motion being communicated from the prime mover by means of the bands,pulleys, and shafts before described, the holder 'L with a suitablepiece of stone attached is rapidly revolved, while bearing upon thesurface of the block M by its own gravity; water and sand being appliedin proper quantity and in any convenient manner, an attendant moves therubber over any portion of the surface in the direction of the arcs ofthe circles having their centers in A and D or in any of theircombinations, with ease and facility. He is thus enabled to accomplishwhat cannot be done by any of the contrivances now in use, thenecessarily rapid motion of the wet rubber upon the stone causing anadhesion between them, to overcome which great force is required.

I do not claim the use of a revolving selfadjusting polisher or grinderor the manipulating apparatus separately considered, but What I claim asmy invention and desire to secure by Letters Patent is- The manipulatingapparatus (consisting of the shaft A, crane C, radial arm G and signedmy name this 4th day of November Whfiifl I]; as abiwe described)findcombinathgl 1854. Wit t e revo Ving and sel a justin ru her orPolisher constructed and arl anged LOUIS ROBBINS 5 substantially in themanner set forth and Witnesses:

for the purposes specified. E. R. MASON,

In testimony whereof I have hereunto JOHN M. EAGER.

